We will not start to guess how your work is organising the safety settings. You do not point out in case your password comes from a cloud supply or is simply native to the Mac.
IT can inject customized code and scripts in your Mac and/or applications to assist synchronize passwords, it could possibly be you broke (or they broke) the hyperlink between the person password, the keychain password and the pre-boot FileVault password.
They could possibly be making an attempt to escrow a FileVault token with MDM, they could possibly be working scripts and residential designed software program, they might have incorrectly configured Intune.
Your path ahead is to doc the problems that is inflicting you and work to assist them perceive the influence after which be as gracious as you may be whereas they marshall no matter assets they should assist the entrance line workers that attempted some issues and will or could not have even documented the triage steps they tried with you.
To repair this – somebody might want to know and think about the precise {hardware} you have got, the precise customizations, prepare time to work with you and practice / evaluation course of. Then they should think about the design of Apple aspect and think about all of the Intune settings and any modifications / administration profiles which were pushed to your system. Then they should design some exams to verify what occurred, then they should prepare a plan to repair your problem and replace their tooling and processes and documentation or to tell you they decided to make your life somewhat extra sophisticated and that is the meant implementation.
Conserving passwords synced typically exposes you to safety dangers until it is executed with diligent analysis, care, coding and choices. An IT division can optimize for his or her ease of help or your ease of use and infrequently these objectives are at battle they usually compromise one or each events of their choices to implement safety apply.
Good luck!